Well if you look closely under the wings you will see that this is fitted with rockets under each wing, which can be released before landing.
Anyway, I thought it would be a good idea if I fitted a couple of bombs under the wings to drop on a bombing run, and I found such a bomb at HobbyKing
These bombs are supplied with their own servo less release system, but I wasn't going to use these as I wanted to use the rocket release servo already in place. For that I needed to fabricate mounting plates.
And then glue them onto the bombs.
And fitted to the Tiffy.
But better still, watch the video.